Alert archive / Alabama / Tornado Watches in 2006
Tornado Watch 91
The Storm Prediction Center issued this tornado watch at Mar 13, 2006, 5:56 PM CST for 17 counties in Alabama; 9 counties in Georgia. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 13, 2006, 5:56 PM CST (23:56 UTC)
- Expired
- Mar 13, 2006, 10:10 PM CST
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
All 26 counties
Bibb County, AL, Blount County, AL, Calhoun County, AL, Cherokee County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, DeKalb County, AL, Etowah County, AL, Jackson County, AL, Jefferson County, AL, Marshall County, AL, Perry County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Catoosa County, GA, Chattooga County, GA, Dade County, GA, Floyd County, GA, Gordon County, GA, Murray County, GA, Polk County, GA, Walker County, GA, Whitfield County, GA
The radar
The Northeast Alabama radar (KHTX), 89 km from the middle of the area, began a volume at 23:58 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
Warnings issued inside it
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 13, 6:01 PM CST | Tornado Warning | BMX | Blount | 44 min |
| Mar 13, 6:36 PM CST | Tornado Warning | BMX | Jefferson | 54 min |
| Mar 13, 6:42 PM CST | Tornado Warning | BMX | Blount, Etowah, St. Clair | 63 min |
| Mar 13, 7:26 PM CST | Tornado Warning | BMX | Jefferson | 40 min |
| Mar 13, 7:42 PM CST | Tornado Warning | BMX | Calhoun, Cherokee, Etowah | 35 min |
| Mar 13, 7:54 PM CST | Tornado Warning | BMX | St. Clair | 29 min |
| Mar 13, 8:14 PM CST | Severe Thunderstorm Warning | BMX | Bibb | 20 min |
| Mar 13, 8:18 PM CST | Severe Thunderstorm Warning | BMX | Jefferson | 16 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Birmingham, AL (KBMX), launched 12:00Z, 11.9 hours before the alert went out and 125 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 37 J/kg
- Mixed-layer CIN
- -28 J/kg
- Mixed-layer LCL
- 552 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 60 m²/s²
- 0-3 km storm-relative helicity
- 138 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 132357
SEL1
SPC WW 132357
ALZ000-GAZ000-140500-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 91
NWS STORM PREDICTION CENTER NORMAN OK
555 PM CST MON MAR 13 2006
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
CENTRAL AND NORTHEAST ALABAMA
EXTREME NORTHWEST GEORGIA
EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 555 PM UNTIL 1100
PM CST.
TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 40 STATUTE MILES
EAST AND WEST OF A LINE FROM 45 MILES NORTH OF ROME GEORGIA TO 15
MILES EAST SOUTHEAST OF CENTREVILLE ALABAMA. FOR A COMPLETE
DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
(WOUS64 KWNS WOU1).
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.
OTHER WATCH INFORMATION...CONTINUE...WW 88...WW 89...WW 90...
DISCUSSION...ONGOING SUPERCELLS ACROSS N CENTRAL AND NW AL SHOULD
CONTINUE EWD TOWARD CENTRAL/NE AL THE NEXT FEW HOURS. THOUGH THE
BOUNDARY LAYER WILL GRADUALLY COOL WITH THE LOSS OF SURFACE
HEATING...SOME INCREASE IN LOW-LEVEL MOISTURE WITH TIME WILL DELAY
SURFACE STABILIZATION. EXPECT VERTICAL SHEAR AND INSTABILITY TO
REMAIN SUFFICIENT FOR SUPERCELLS CAPABLE OF PRODUCING A COUPLE OF
TORNADOES...ALONG WITH DAMAGING WINDS AND SOME HAIL FOR THE NEXT FEW
HOURS.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
450. MEAN STORM MOTION VECTOR 26030.
...THOMPSONSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 13, 12:36 PM CST | Mesoscale Discussion | SPC | Colbert, Fayette, Franklin, Lamar, Lauderdale, Lawrence and 6 more | 114 min |
| Mar 13, 1:48 PM CST | Tornado Watch | SPC | Colbert, Cullman, Fayette, Franklin, Greene, Hale and 12 more | 6 hr |
| Mar 13, 3:32 PM CST | Mesoscale Discussion | SPC | Choctaw, Clarke, Marengo, Monroe, Washington, Wilcox | 88 min |
| Mar 13, 3:59 PM CST | Mesoscale Discussion | SPC | Blount, Colbert, Cullman, Fayette, Franklin, Jackson and 13 more | 91 min |
| Mar 13, 5:41 PM CST | Mesoscale Discussion | SPC | Bibb, Blount, Calhoun, Cherokee, Clay, Cleburne and 25 more | 64 min |
Nearby
Tornado Watches in Alabama, 2006Tornado Watches in Georgia, 2006Every tornado watch in 2006
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.